For a week now I have had this lump on the inside of my left cheek. It is towards that back of my mouth by my molars. At first I thought I had bitten my cheek or that I had gotten hit while at the dentist. However, it doesn't really feel like all of the other times things like that have happened. I can move it up and down with my tongue. It is skinny. It only hurts if I hit it with the toothbrush or eat something irritating like citrus or salt. It is the same color as the rest of my cheek. Am I worrying for nothing?